Platform elevator



Nov. 6 1923; v

A. D. HEYL PLATFORM ELEVATOR ATTORNEYS Filed Jan. 27. 1922 Patented Nov6, i923.

earner ALBERT D. HEYL, OF NEW YORK, N. Y.

PLATFORIVI ELEVATOR.

Application filed January 27, 1922. Serial No. 532,121.

To all whom it may concern:

Be it known that I, Annnnr D. HEYL, a citizen of the United States,residing in the city and county of New York, State of New York, haveinvented a new and useful Platform Elevatonof which the following is aspecification.

' My present invention comprehends a novel construction of a platformelevator of the type which does not carry an operator and wherein novelmechanism is employed for controlling its operation.

It further comprehends a novel construction and arrangement of manuallycontrolled devices for the mechanism employed to effect the raising andlowering of the platform.

Other novel features of construction and advantage will hereinafter moreclearly appear in the detailed description of my invention. r

For the purpose of illustrating my invention, I have shown in theaccompanying drawings a form thereof which is at present preferred byme, since it will give in practice satisfactory and reliable results. Itis to be understood, however, that the various instrumentalities ofwhich my invention con sists can be variously arranged and organized andthat my invention is not limited to the precise arrangement andorganization of these instrumentalities as herein shown and described.

' Figure 1 represents a platform elevator embodying my invention.

, Figure 2 represents in elevation a portion of the construction seen inFigure 1.

Similar numerals of reference indicate corresponding parts.

1 designates stationary guides of any desired character, with whichcooperate the platform or gig 2. The gig 2 has connected. to it ahoisting cable 3 which passes over a sheave 4; and around a drum 5 towhich its free end is connected in any desired manner. The drum 5 ismounted on a shaft 6 having eccentric bearings 7, supported in anydesired or conventional manner. The shaft 6 has fixed to it a frictionWheel 8, which, at desired times, cooperates with a stationary brakeshoe 9 carried by the stationary sup port 10. The drum shaft 6 isarranged between the pinion shaft 11 and the brake shoe 9, so that thefriction-wheel 8 is free to rotate and by adjustment of the eccentricbearings can be brought into contact with the friction pinion 12 on theshaft 11 or into contact with the brake shoc'9.

18 designates a motor of any desired type which is intergeared by meansof gear wheels 14 and 15 respectively with the shaft 11.

The eccentric bearings T have connected to them an arm 16 provided withan adjust able counterbalance 17, and connected to this arm is one endof a cable 18 which passes over the sheaves 19 and is connected at itsother end to a latch bar 20, guided in a guide bracket 21, supported insuch manner that it is stationary.

The lower end of the latch. bar 20 has connected to it at one end thecable 21. which passes around the adjustably mounted sheave 22 and thenaround a sheave 23, and the free end of such cable 21 is connected to aweight 24, which is in the path of the platform or gig 2 during itsupward movement. The platform 2 is provided with a head 25 to contactwith the weight 24 during the operation.

The sheave 22 is mounted in a block 26 and to this block is connectedthe ends of the cable27, and, as is best understood from Figure 2, thiscable passes around sheaves 28 mounted in stationary brackets 29.

The latch bar 20 is provided with a series of apertures 30, in orderthat a latch block 31 can be adjustably secured to the latch bar 20.

32 designates a late). which is in the form; v of a lever pivoted 33 tothe bracket 21, and a spring 34 is provided one end of which is fixed tothe bracket 21 and the other end of'which bears against the latch 32 toeffect its movement into latching position. v The latch 32 hasconnectedto it a cable 38 having a grasping handle by means of which it may beactuated, as will be here inafter explained. v

36 designates a cable having an actuating handle 3'? at one end andhaving its opp'o site end passing around the sheave 19 and connected tothe arm '16 so that when this cable is drawn downwardly the arm 16 willbe raised, thereby causing friction wheel-"8 tomove out of contact withthe brakeshoe 9and the platform orgig 2am be permitted to movedownwardly by gravity.

The winding drum' 5 and the friction wheelS rotatein unison, andbyadjustment of the arm 16 to varythe eccentricity of the bearings 7 thefriction wheel 8 will lee-power driven, or its rotation arrested .by.the; brake shoef' V s l 7 When the friction wheel 8 isflcatingqbetweenits pinion12 and the brake shoe9, the weight 24tis greaterthaniithewweight of the e 'counterbalance'l'Z, so that when the latch 32is tripped by a=pull =on 'the cable 38, the

weight 24drops and causes the cable 21 to raise the arnr 16, therebyadjusting the eccentricbearings to cause the friction wheel 8 to engagethe motor dr ven friction pinlon 12. The friction wheel 8is'thus-rotated, and V the hoisting cable wound up on the hoisting drum5 'to cause theupwardtravel of the platform or gig 2.

Sheave 28 is operated'by a handle 39 and has recesses lO to receive apin41 carried by the sheave bearing. 1 'llhis upward movement continuesuntil the "platform or gig 2"meets andraises the i weight 24. As theAVeight'Q-t 'is'raised, thev weight 17 moves downwardly, thus turningthe eccentric bearingsand causing the trio-- ti-on wheel 8 to moveonto]? eng-agement'with ltSfClIlVlllg pinion 1'2' and into engagementwith the brake shoe' 9, whereupon the gig 2will-bebrought to rest, as isapparent.

The upward travel of :the platform can be arrested at-any-point byadjustingthe position of the sheave 22 by means of the cable 27, as isapparent. q It will be apparent that in accordance f with myinvention,'I provideuneans which automatically operate 'to' stop theupward travel'of the platform-'or-glg at any desired height and thusprevent any overrunnlng or V damage-to the machinery, since the poweris; automatically cut off by the raising of the weight 2 L by theplatform or gig when it approaches the limit of'its upward travel.

' spring upon the latch, so that the platform When the latc'h bar 20moves up, due to this action, it will be'apparent that thela't'ch block31 will 'pass by t'hefllatch- 82, so that the cam" face of the lattercan slide beneath.

the"latchblock' 3l' due to the action of the will be retainedin theposition at whieh it has-been' arrest'edq It'will'now-be apparent'thatram devised a novel and useful platform elevator, which embodies thefeatures. of advantages enumerated as desirable in*thestatement of theinvention and therabove description, and

were I have in the; present instance, shown and "described -'a preferred"embodiment thereof=which Will -give in practice satisfactory andreliable fres'ulta-fit is to be understood thatisuch embodimentis'susceptible er modification in various particulars out'departingfronl the spirit or scope of the invention or sacrificing any of'itsiadvantages. V

eHa ving thus described niyinvention, what Iclaim'as new and desire tosccure by Let ters Patent, is r V Y 1 In aplatform elevator,'thecombinatioi'i witha'friction 'driveand a brake shoe, of a friction wheelhavlng eccentric bearings and interposed between said friction drive andL IbI'akBx, shoe,';'acounterbalanced arm 'c0n-- 'uected with sa dbearings 'to'cause thefric' jtion wheel to'cofoperate with its frlct on7 drive or said brake shoe or to float tree be tween them, a hoistingdrum operatively con ected with said friction wheel to inovein unisonwith it, a gig, a cable connectedwith ,the raising of said'gig; V

2. In a platform elevator, the combination with a friction drive andabrake shoe; of a friction wheel having eccentric'bearings andinterposed between said '7 friction 1 drive and brakeshoe,''acounterbalanced arm connected with said hearings to cause thefriction' wheel to cooperate with its "friction drive or said brake shoeor to float free between them, a hoisting drum operatively con; neotedwit-h'saidf friction wheel to move-in unison with it, a cable connectedwith Y said hoisting drum and withsaid gig, a

' weight in the pathv ofthe upward travel'of said gig of greater weightthan said counterbalance, latch "mechanism opera-titely connect'ed withsaidweight and with said arm to retain said friction wheel in contactwith said brake shoeymanually controlledmeans" to 7 release said latchmechanismito-causesaid 1 wheel," and independent manually controlledmeans to causesaid frictiofiwheel to -engage its friction drive. 7 r r VV 3. In a platform elevator, thecombination with asfric'tion drive andakbrakebhde, ofa friction wheelhaving eccentric" bearings'and interposedbetween said friction drive-and brake shoe, acounterbalance' armconnected with said bearings torcause the friction weight to move' saidarm and thereby" cause i the friction d'riveto "drive-said frictior'rwheel to-Cooperatewith its'irict ion 'drive or said brake -shoe or-to'floatfree between them,

'a'phoisting drum *operatively eonne'cted with said friction wheel tomove in unison with it, a gig, a cable connected with said hoisting drumand with said gig, a weight in the path of the upward travel of said gigof greater weight than said counterbalance, latch mechanism operativelyconnected with said arm to retain said friction wheel contact with saidbrake shoe, a pair of spaced sheaves, a cable passing around saidsheaves, a block to which the ends of said brake shoe, a counterbalancedarm connected with said bearings to cause the fric tion wheel toco-operate with its friction drive or said brake shoe or to float freebetween them, a hoisting drum operatively connected with said frictionwheel to move in unison with it, a gig, a cable connected with saidhoisting drum and with said gig, a weight in the path of the upwardtravel of said gig of greater weight than said counterbalance, latchmechanism operatively connected with said weight and with said arm toretain said friction wheel in contact with said brake shoe, said latchmechanism including a stationary bracket, a latch bar slidable therein,a latch block adjustable on said bar, a latch in the form of a springpressed lever to engage said latch block, and means to release saidlatch mechanism at the will of the operator, means to adjust theposition of said weight, and means to release said latch mechanism tocause said weight to move said arm and thereby cause the friction driveto drive said friction wheel.

5. In a platform elevator, a hoisting drum, a friction drive and a.brake shoe, a friction wheel co-operating with said drive and brake shoeand connected with said drum, a counterbalanced arm to move said wheelinto contact with said friction drive or said brake shoe, a gig, a cableconnecting said drum and gig, a latch bar, a cable connecting said latchbar and arm, a latch block adjustable on said latch bar, a springactuated latch to engage said latch block, a weight in the path of theupward movement of said gig, a cable connecting said weight and latchbar, and a manually actuated cable connected with said latch to effectits release.

6. In a platform elevator, a hoisting drum, a friction drive and a brakeshoe, a friction wheel between said friction drive and brake shoe andconnected with said drum, a counterbalanced arm to move said wheels intocontact with said friction drive or said brake shoe, a gig, a cableconnecting said drum and gig, a weight in the path of the upward travelof said gig of greater width than said counterbalance, latch mechanismconnected with said arm and including a latch bar, a cable connectingsaid latch bar and said weight, a pair of spaced sheaves. a cablefastened around said sheaves, a pulley block to which the free ends ofsaid sheave cable are connected, a third sheave around which the pulleypassing to said weight passes, such cable also passing through thepulley of said pulley block, a handle connected with one of the sheavesaround which the pulley block cable passes for adjusting the heightofsaid weight, and means to lock the handle carrying sheave in a positionto which it has been adjusted.

ALBERT D. HEYL.

